1) the rear end or a process or prolongation of the rear end of the body of an animal

2) one end of a molecule regarded as opposite to the head esp the end of a lipid molecule that consists of a nonpolar hydrocarbon chain and is opposite to the polar group &LT;most surface-active agents have a long hydrophobic \tail attached to a polar head (R. E. Kirk & D. F. Othmer)&GT;

tail — 1 n [Anglo French, literally, cutting, from Old French, from taillier to cut, prune] 1: the condition of being limited or restricted by entailing a tenant in tail 2: entail (2) tail 2 adj: limited as to tenure see al … Law dictionary

tail — ► NOUN 1) the hindmost part of an animal, especially when extended beyond the rest of the body. 2) something extending downwards, outwards, or back like an animal s tail. 3) the rear part of an aircraft, with the tailplane and rudder. 4) the… … English terms dictionary

Tail — Tail, v. t. 1. To follow or hang to, like a tail; to be attached closely to, as that which can not be evaded. [Obs.] [1913 Webster] Nevertheless his bond of two thousand pounds, wherewith he was tailed, continued uncanceled, and was called on the … The Collaborative International Dictionary of English

Tail — Tail, n. [F. taille a cutting. See {Entail}, {Tally}.] (Law) Limitation; abridgment. Burrill. [1913 Webster] {Estate in tail}, a limited, abridged, or reduced fee; an estate limited to certain heirs, and from which the other heirs are precluded;… … The Collaborative International Dictionary of English